remove useless and incorrect neighbor list request in fix qeq/comb/omp

  ngroup = group->count(igroup);

  if (ngroup == 0) error->all(FLERR,"Fix qeq/comb group has no atoms");

  // determine status of neighbor flag of the omp package command

  int ifix = modify->find_fix("package_omp");

  int use_omp = 0;

  if (ifix >=0) {

     FixOMP * fix = static_cast<FixOMP *>(lmp->modify->fix[ifix]);

     if (fix->get_neighbor()) use_omp = 1;

  }

  int irequest = neighbor->request(this,instance_me);

  neighbor->requests[irequest]->omp = use_omp;

}

/* ---------------------------------------------------------------------- */